Electric guide lamp



Aug. 11, 1936.

1.. LUDWIG 1 ELECTRIC GUIDE LAMP Filed Nov. 16, 1954 INVENTOR. lav/ s Zudw/y A TTORNEYS.

Patented Aug. 11, 1936 UNITED STATES PATENT OFFICE 1 Claim.

The invention relates to electric lamps and has for its main object toprovide a lamp of very small size which can be employed as a guide lighand inserted directly in an electric outlet, and which can be somanipulated as to intensely illuminate a small area or to less intenselyilluminate a larger area. Another object is to provide a lamp of thiskind with means whereby it may be clamped or secured to various objectsand connected by wires to an outlet, when such outlet is not in a placewhere it is desired to use the lamp.

A further object is to provide a lamp of attractive appearance, which isextremely simple in its construction, which can be manufactured at avery low cost, and which can be put to a very great many uses.

These and various other objects and advantages may be readily understoodfrom the following description and from the accompanying drawing ofpreferred embodiments in which, however, modifications may be madewithout departing from the scope of the appended claim. In the drawingFig. 1 is a side view of the guide lamp,

Fig. 2 a cross-sectional plan view,

Fig. 3 an end view,

Fig. 4 another end view,

Fig. 5 a side elevation of the lamp shown attached to a clamping member,and

Fig. 6 a bottom view showing certain details of construction employed inthe embodiment shown in Fig. 5.

Referring now to Figs. 1, 2, 3 and 4, the device consists of a hollow,cylindrical body member ID in one end of which a threaded shell II isinserted. The bottom of this shell is provided with an insulating washerI2. Another insulating washer I3 is inserted in the other end of thebody member and this washer is provided with two rectangular openingsthrough which the prongs I4 and I5 pass. The prong I4 is provided withan angular member I6 and through this member and the washer l3 a bolt I1passes. A nut I8 on the end of the bolt clamps the threaded shell II, aswell as the washer I3 in place, as plainly shown in Fig. 2. Anelongated, cylindrical bulb I9 is inserted in the shell II and on thisbulb a shade 20 is mounted. This shade is provided with fingers 2| whichare riveted to the shade by a rivet 22 and are free to slidelongitudinally on the cylindrical part of the bulb.

The prong I5 extends some distance into the body member and is securedto it by a shouldered bushing 23. A hole 24 in this bushing is threadedand a screw 25, provided with an insulating knob 26, is free to turn inthis thread. The end of the screw 25 engages against a spring 21 whichis riveted to the prong I5. When the knob 26 is turned the spring 21engages with the threaded shell II. Thus when the prongs are inserted inan outlet box the current will flow through prong I5, shell II, throughthe shell of the lamp, through the lamp and back from the center contact28 of the lamp, through the bolt IT, to the prong I4.

While I prefer to employ the spring 21 to engage the threaded shell II,it is evident that, by moving the switch up farther towards the bulbendof the lamp body as shown in Fig. 5, the spring may be omitted and theend of the screw 25 be made to engage directly with the shell II.

When the lamp is inserted in an outlet, the area around the box which isilluminated by the bulb will depend upon the position of the shade inrelation to the bulb. When the shade is in the position shown in Fig. 2a relatively small circular area, of a relatively high intensity will beilluminated, while when the shade is in the position shown in Fig. 1 amuch larger area, but

of much lesser intensity, will be illuminated.

In Fig. 5 the prongs have been eliminated and the lamp shown secured toa clamp 29. In this case the lamp may be clamped to any object that itis desired to illuminate and the cord 30, which contains the wires 3|and 32, connected to the outlet. The wires 3| and 32 are secured to thebinding screws 33 and 34. The binding screw 33 is connected to the boltI! by a metal contact 35, while the binding screw 34 is connected to ametal contact 36 which extends upward in the housing and which isriveted to the lamp body by the bushing 23, as previously explained. Thelamp is secured to the clamp by means of screws 31 and 38 which engagesin holes 39 and 40 drilled and tapped in the washer I3. All the otherparts are numbered as in Figs. 1 to 4.

Having. described my invention and its objects, what I claim is new andwish to protect by Letters Patent is:

An electric lamp of the class described comprising a tubular bodymember; a lamp socket, having an outwardly extending flange at its openend, inserted in one end of the body member with the flange inengagement with the end of the body member; an interior shoulder formedin the other end of the body member; an insulating washer inserted inthe body member against said shoulder; a pair of attachment prongsextending outwardly from said washer; one of said prongs secured to thewasher by means of a bolt which also clamps the lamp socket and thewasher in the body member and which forms the center contact of the lampsocket; the other prong secured to the body member; a spring membersecured to the last-mentioned prong; and a switch handle for engagingand disengaging said spring member with the metal shell of the lampsocket.

LOUIS LUDWIG.

